Kawasaki Ko to Onomichi-Itozaki — sea route & marine weather
The sea route from Kawasaki Ko (JPKWS) to Onomichi-Itozaki (JPONX) is about 976 nm — about 4 days at 10 kn. Along the route today (Sep 14): wind 2–16 kn, waves 0.3–1.5 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 976 nm |
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| Passage time at 10 kn | about 4 days |
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| Great-circle distance | 332 nm |
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| Kawasaki Ko | 35°30.0′N 139°46.0′E |
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| Onomichi-Itozaki | 34°23.0′N 133°10.0′E |
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| Reference vessel | 4.5 m draft, 10 kn cruise |
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10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
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| 2–16 kn | 20 kn | 0.3–1.5 m |
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| N 2–19 kn | 27 kn | 0.2–1.5 m |
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| NE 2–24 kn | 33 kn | 0.2–2.1 m |
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| NE 4–30 kn | 42 kn | 0.3–3.3 m |
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| NE 3–29 kn | 42 kn | 0.2–3.8 m |
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| NE 4–26 kn | 32 kn | 0.2–4.3 m |
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| NNE 4–28 kn | 36 kn | 0.6–4.9 m |
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| NNE 13–32 kn | 48 kn | 1.1–6.7 m |
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| N 3–24 kn | 80 kn | 0.6–4.5 m |
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| NE 5–20 kn | 26 kn | 0.3–2.0 m |
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Forecast from the ECMWF IFS model run , waves from ECMWF WAM. Updated with each model cycle; the live chart below recalculates for your departure time and vessel.
Frequently asked
How far is it from Kawasaki Ko to Onomichi-Itozaki by sea?
The water route is 976 nm (1,808 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Onomichi-Itozaki to Kawasaki Ko.
How long does the passage from Kawasaki Ko to Onomichi-Itozaki take?
about 4 days at a 10 kn cruise. Scale by your own speed: at half the speed it takes about twice as long. The planner on this page recalculates for your vessel and live weather.
What is the weather between Kawasaki Ko and Onomichi-Itozaki today?
Along the route today, per the ECMWF IFS run 2026-09-14 12z: wind 2–16 kn, waves 0.3–1.5 m. The day-by-day table on this page covers the next 10 days.